Remove unused berofos tool and documentation

The command xivo-berofos is not anymore used by wazo for many years. So it doesn’t make sense to keep and support this cli anymore if we don’t test it

Any member of the community wanted to keep this wrap up tool can fork the script from

Note:

• Jenkins: bntools job deleted

• Github: bntools repo deleted

• wazo-production-sf-config: Push to master

• mirror.wazo.community: bntools package removed from *-dev-buster distros